Deformation theory and quantization. II. Physical applications: F. Bayen, Département de Mathématiques, Université de Paris 6, 75230 Paris Cedex 05, France; M. Flato and C. Fronsdal, Department of Physics, University of California, Los Angeles, California 90024; A. Lichnerowicz and D. Sternheimer, Physique Mathématique, Collège de France, 75231 Paris Cedex 05, France